diff options
Diffstat (limited to 'libio/fileops.c')
| -rw-r--r-- | libio/fileops.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/libio/fileops.c b/libio/fileops.c index b4bd5ce7cd..1851d9a1fa 100644 --- a/libio/fileops.c +++ b/libio/fileops.c @@ -308,7 +308,15 @@ DEFUN(_IO_file_overflow, (f, ch), _IO_doallocbuf(f); _IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base); } - /* Otherwise must be currently reading. */ + /* Otherwise must be currently reading. + If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end, + logically slide the buffer forwards one block (by setting the + read pointers to all point at the beginning of the block). This + makes room for subsequent output. + Otherwise, set the read pointers to _IO_read_end (leaving that + alone, so it can continue to correspond to the external position). */ + if (f->_IO_read_ptr == f->_IO_buf_end) + f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base; f->_IO_write_ptr = f->_IO_read_ptr; f->_IO_write_base = f->_IO_write_ptr; f->_IO_write_end = f->_IO_buf_end; |